Oscar, as a baby in Ghostbusters II, would likely be confused and curious about his encounter with Vigo the Carpathian. If he could understand the situation, he might initially feel frightened, sensing the dark presence. However, being so young, he might also be fascinated by the colorful, larger-than-life spirit, almost like a character from a storybook.
Once the Ghostbusters arrived to save him, Oscar would probably feel a sense of relief and safety in their presence. He might even laugh at the goofy antics of the Ghostbusters, viewing them as heroes. Overall, his reaction would likely blend fear, innocence, and a budding sense of adventure as he witnesses the fantastical clash between good and evil.
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